Patents by Inventor Merete Skar
Merete Skar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8314187Abstract: A multimodal medium density polyethylene polymer obtainable using single site catalysis which comprises at least: (A) a lower molecular weight (LMW) polyethylene homopolymer component; and (B) a higher molecular weight (HMW) polyethylene copolymer component which is a copolymer of ethylene and at least one C3-12-alpha olefin; wherein said multimodal medium density polyethylene polymer has a density of 925 to 945 kg/m3 and a comonomer content of less than 2.5 mol %.Type: GrantFiled: January 24, 2008Date of Patent: November 20, 2012Assignee: Borealis Technology OyInventors: Irene Helland, Merete Skar
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Publication number: 20100099824Abstract: A multimodal medium density polyethylene polymer obtainable using single site catalysis which comprises at least: (A) a lower molecular weight (LMW) polyethylene homopolymer component; and (B) a higher molecular weight (HMW) polyethylene copolymer component which is a copolymer of ethylene and at least one C3-12-alpha olefin; wherein said multimodal medium density polyethylene polymer has a density of 925 to 945 kg/m3 and a comonomer content of less than 2.5 mol %.Type: ApplicationFiled: January 24, 2008Publication date: April 22, 2010Applicant: BOREALIS TECHNOLOGY OYInventors: Irene Helland, Merete Skar
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Patent number: 7517941Abstract: A shrink film comprising a polyethylene film of thickness 5 to 500 ?m, wherein the polyethylene comprises an ethylene homopolymer-copolymer mixture having a molecular weight distribution in the range of 5 to 40, and a weight average molecular weight of at least 100 kD.Type: GrantFiled: July 29, 2003Date of Patent: April 14, 2009Assignee: Borealis Technology OyInventors: Ole Jan Myhre, Merete Skar, Hans Georg Daviknes, Kjetil Larsen Borve, Geir Morten Johansen
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Patent number: 7504141Abstract: A shrink film comprising a polyethylene film, characterized in that said polyethylene is an ethylene copolymer mixture having a molecular weight distribution in the range 10 to 35, a density of 915 to 940 kg/m3, a weight average molecular weight of at least 100000 D and an MFR2.16 (190° C.) of 0.1 to 0.9 kg/m3, which copolymer mixture is produced by a two or more stage copolymerization of ethylene and 2 to 10% mole (relative to ethylene) of a C3-12 alpha-olefin comonomer in a series of reactors including at least one slurry loop reactor and at least one gas phase reactor using a heterogeneous Ziegler-Natta catalyst.Type: GrantFiled: July 29, 2003Date of Patent: March 17, 2009Assignee: Borealis Technology OyInventors: Ole Jan Myhre, Merete Skar, Hans Georg Daviknes, Kjetil Larsen Brove, Geir Morten Johansen
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Publication number: 20080139749Abstract: A multimodal copolymer of ethylene comprising at least (i) a lower molecular weight fraction of a copolymer of ethylene and at least one alpha-olefin comonomer and (ii) a higher molecular weight fraction of a copolymer of ethylene and at least one alpha-olefin comonomer, wherein said copolymer has a density below 920 kg/m3.Type: ApplicationFiled: December 22, 2005Publication date: June 12, 2008Applicant: Borealis Technology OyInventors: Arja Lehtinen, Merete Skar, Jarmo Lindroos, Janne Maaranen, Markku Vahteri, Hans Eklind, Holger Poehler, Alexander Krajete
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Publication number: 20080057238Abstract: A multilayer film comprising at least three layers, two outer layers and a core layer, each outer layer independently comprising an LLDPE component and said core layer comprising a multimodal polyethylene component having a lower molecular weight component and a higher molecular weight component, wherein the density of the higher molecular weight component is less than 915 kg/m3 and the MFR2 of the higher molecular weight component is less than 1 g/10 min.Type: ApplicationFiled: October 4, 2005Publication date: March 6, 2008Applicant: BOREALIS TECHNOLOGY OYInventors: Arild Follestad, Arno Johansen, Merete Skar, Georg Daviksnes
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Patent number: 7256239Abstract: A film of a polyethylene produced by polymerization catalysed by a single site catalyst and comprising as comonomers to ethylene at least two C4-12 alpha olefins, preferably but-1-ene and hex-1-ene.Type: GrantFiled: February 4, 2003Date of Patent: August 14, 2007Assignee: Borealis Technology OyInventors: Irene Helland, Merete Skar, Jani Äärilä, Marja Ora, Markku Vahteri
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Publication number: 20070037932Abstract: Use of a first polyethylene polymer having a density of at least 950 kg/m3 as a nucleating agent for a second polyethylene polymer having a density of less than 940 kg/m3.Type: ApplicationFiled: August 3, 2004Publication date: February 15, 2007Inventors: Espen Ommundsen, Merete Skar, Katrin Nord-Varhaug
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Publication number: 20060106182Abstract: A shrink film comprising a polyethylene film of thickness 5 to 500 ?m, wherein the polyethylene comprises an ethylene homopolymer-copolymer mixture having a molecular weight distribution in the range of 5 to 40, and a weight average molecular weight of at least 100 kD.Type: ApplicationFiled: July 29, 2003Publication date: May 18, 2006Inventors: Ole Myhre, Merete Skar, Hans Daviknes, Kjetil Borve, Geir JOhansen
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Patent number: 7018710Abstract: A process for the preparation of a heat sealable film comprising a core layer and a sealing layer, said process comprising attaching said core layer to said sealing layer, said sealing layer comprising an ethylene copolymer composition in which: (1) there are two distinct maxima in the TREF fractogram of the ethylene copolymer composition; (2) at lest 10%, of the ethylene copolymer composition elutes in TREF at a temperature of less than 50° C.; (3) at least 25%, of the ethylene copolymer composition elutes in TREF at a temperature of higher than 75° C.; (4) none of the ethylene copolymer composition elutes in TREF at a temperature of higher than 100° C.Type: GrantFiled: June 29, 2001Date of Patent: March 28, 2006Assignee: Borealis Technology OyInventors: Kalle Kallio, Jari Äärilä , Merete Skar, Arja Lehtinen
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Publication number: 20050271868Abstract: A shrink film comprising a polyethylene film, characterized in that said polyethylene is an ethylene copolymer mixture having a molecular weight distribution in the range 10 to 35, a density of 915 to 940 kg/m3, a weight average molecular weight of at least 100000 D and an MFR2.16 (190° C.) of 0.1 to 0.9 kg/m3, which copolymer mixture is produced by a two or more stage copolymerization of ethylene and 2 to 10% mole (relative to ethylene) of a C3-12 alpha-olefin comonomer in a series of reactors including at least one slurry loop reactor and at least one gas phase reactor using a heterogeneous Ziegler-Natta catalyst.Type: ApplicationFiled: July 29, 2003Publication date: December 8, 2005Inventors: Ole Myhre, Merete Skar, Hans Daviknes, Kjetil Brove, Geir Johansen
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Publication number: 20050131187Abstract: A film of a polyethylene produced by polymerization catalysed by a single site catalyst and comprising as comonomers to ethylene at least two C4-12 alpha olefins, preferably but-1-ene and hex-1-ene.Type: ApplicationFiled: February 4, 2003Publication date: June 16, 2005Inventors: Irene Helland, Merete Skar, Jani Aarila, Marja Ora, Markku Vahteri
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Patent number: 6632884Abstract: This invention concerns process for producing polyethylene compositions, films prepared thereof and process for the preparation of the films. The process comprises subjecting ethylene, optionally hydrogen and comonomers to polymerization or copolymerization reactions in a multistage polymerization. At least one polymerization stage is conducted essentially in the absence of hydrogen. The polymerization reactions are carried out in the presence of a single-site catalyst capable of forming a composition comprising a low molecular weight component with MFR2 of at least 10 g/10 min and a density higher than the density of the composition and a high molecular weight component. The melt flow rate of the composition is in the range MFR2=0.1-5.0 g/10 min and the density of the composition is 915-960 kg/m3. The invention makes it possible to produce polyethylene compositions for manufacturing films with a good balance between optical and mechanical properties.Type: GrantFiled: October 1, 2001Date of Patent: October 14, 2003Assignee: Borealis Technology OyInventors: Merete Skar, Ole Jan Myhre, Arja Lehtinen, Harri Hokkanen, Hilkka Knuuttila, Kalle Kallio, Esa Kinnunen, Eija Lappi
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Publication number: 20030171501Abstract: A process for the preparation of a heat sealable film comprising a core layer and a sealing layer, said process comprising attaching said core layer to said sealing layer, said sealing layer comprising an ethylene copolymer composition in which: (1) there are two distinct maxima in the TREF fractogram of the ethylene copolymer composition; (2) at lest 10%, of the ethylene copolymer composition elutes in TREF at a temperature of less than 50° C.; (3) at least 25%, of the ethylene copolymer composition elutes in TREF at a temperature of higher than 75° C.; (4) none of the ethylene copolymer composition elutes in TREF at a temperature of higher than 100° C.Type: ApplicationFiled: May 7, 2003Publication date: September 11, 2003Inventors: Kalle Kallio, Jari Aarila, Merete Skar, Arja Lehtinen